fig5

Figure 5. (A) The preparation of the Pd/Cu, K/Pd/Cu foam anodes, and the deformation charge density of K⁺ absorbed on Cu and Pd substrates, respectively; Galvanostatic profiles for KMB cells with 1.0, 3.0, 5.0, and 10.0 mA h cm^-2 of K on K/Pd/Cu foam and K/Cu foam. This figure is quoted with permission from Wang et al.^[94]. (B) The synthesis and mechanism of Au/Cu foam current collector and the calculated adsorption energy of K⁺ with Au and Cu. This figure is quoted with permission from Li et al.^[95].